■ noun each of two regions of intense radiation partly surrounding the earth at heights of several thousand kilometres.
Origin
1950s: named after the American physicist J. A. Van Allen .
■ noun each of two regions of intense radiation partly surrounding the earth at heights of several thousand kilometres.
Origin
1950s: named after the American physicist J. A. Van Allen .
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004